324 A method of cooling the Air of [No. 10, new series. 



frigeration is to be applied. At the lowest bend of the pipe, after 

 it has left the barrel, is a stop cock, to draw off the water which 

 may be condensed under the tube, and the air may then be allow- 

 ed to enter the room and be breathed by its inmates. 



This completes the apparatus, and the whole is shown in plan 

 and section, in figs. 4 and 5. A light roof is here thrown over the 

 bullock mill, pumps, and tubs, and is continued over the room to 

 be cooled, as a second roof with a space for the wind to blow through, 

 is so excellent a defence against the heat of the sun. The mill is 

 of the simplest form, and such as is now generally made in this 

 country in iron, and of a portable form, under the name of a ' horse 

 work," as used for thrashing machines ; the pump, pipes and valves 

 would of course also be made here, and would not be difficult of 

 transport ; while the water-tubs would be easily made on the spot 

 by Indian carpenters, and in a form best fitted to the local peculi- 

 arities. 



To make all this for the first time, and to add it to a house 

 already built, may seem somewhat expensive ; but looking at it in 

 an a priori sort of view, there does not seem so much to be done 

 as if, to a simple house where rooms should be garnished with no- 

 thing but doors and windows, it was proposed to add chimneys, 

 fire places, grates, fenders, fire irons and chimney pieces. 



The complete proof, however, and that which is so much to be 

 desired, is in the actual making and applying of such an apparatus, 

 and if private persons be afraid of trying new experiments, and are 

 content to lay the flattering unction to their souls, that by mois- 

 tening the hot anJ rarified air with wet mats, or by merely agitat- 

 ing it with punkahs, and setting it in motion by winnowing 

 machines, that they are thereby cooling and condensing it, and 

 bringing it into a similar state with the cold and invigorating air 

 of their native country ; — then it would seem to be a duty of Go- 

 vernment, which has established public hospitals in those climates 

 for the cure of the sick, to adopt any method, which, while it is 

 neither expensive nor difficult, yet promises certainly to supply one 

 of the desiderated means of cure, and to meet the very cause which 

 has sent almost all the patients to the hospitals. At present, such 

 patients must either die there in the hot atmosphere, or are sent 

 home at great expense. What the number may be of these latter 



